Around the release of 'The Gray Chapter', IIRC, Corey and Clown indicated the band would very possibly just continue indefinitely with members swapped out as time goes.
I can't recall which interview, and it might've actually been the Wikipedia Fact or Fiction with Clown, but there was a point where when asked about winding Slipknot down one day, one of them pondered why they couldn't just replace the classic Nine entirely with younger musicians and Slipknot be a generational band. Since the band has always been hyperfocused on being about the music and not the people behind the masks, though there seem to be legitimate reasons behind the departures for each member since Joey, maybe they're not overly concerned with having something of a rotating cast of characters. Maybe this is all falling in to the grand scheme of things, to have a powerful and youthful Slipknot again that can carry the flag once the remainder of the Nine understand they can't embody the name as they once did.